An acquaintance of mine came over to pick up some of my rat babies. She was closely inspecting one and said she saw something on his fur. It took her forever to locate one for me to see. She found one piece of fur with a tiny white blob on it. It didn't look like anything to me, but she said that lice lay nits that stick to the fur. I really didn't see anything-no bugs in his fur or on the fur of any other animals in my house. She found ONE HAIR with something on it. My adult rats have had ivermectin treatments, with the exception of the babies mommies. I have been looking them all over like CRAZY all day! Should I be concerned, or was she just being a bit of a jerk? Frankly, I was insulted.